Android ViewBadger是自定义的视图布局！~
测试项目供3个目标文件，效果如图：
demo主要用到了一个自定义的视图类：
//关键视图类
public class BadgeView extends TextView
{
public static final int POSITION_TOP_LEFT = 1;
public static final int POSITION_TOP_RIGHT = 2;
public static final int POSITION_BOTTOM_LEFT = 3;
public static final int POSITION_BOTTOM_RIGHT = 4;
public static final int POSITION_CENTER = 5;
private static final int DEFAULT_MARGIN_DIP = 5;
private static final int DEFAULT_LR_PADDING_DIP = 5;
private static final int DEFAULT_CORNER_RADIUS_DIP = 8;
private static final int DEFAULT_POSITION = POSITION_TOP_RIGHT;
private static final int DEFAULT_BADGE_COLOR = Color
.parseColor("#CCFF0000"); // Color.RED;
private static final int DEFAULT_TEXT_COLOR = Color.WHITE;
private static Animation fadeIn;
private static Animation fadeOut;
private Context context;
private View target;
private int badgePosition;
private int badgeMarginH;
private int badgeMarginV;
private int badgeColor;
private boolean isShown;
private ShapeDrawable badgeBg;
private int targetTabIndex;
public BadgeView(Context context)
{
this(context, (AttributeSet) null, android.R.attr.textViewStyle);
}
public BadgeView(Context context, AttributeSet attrs)
{
this(context, attrs, android.R.attr.textViewStyle);
}
/**
* Constructor -
*
* create a new BadgeView instance attached to a target
* {@link android.view.View}.
*
* @param context
* context for this view.
* @param target
* the View to attach the badge to.
*/
public BadgeView(Context context, View target)
{
this(context, null, android.R.attr.textViewStyle, target, 0);
}
/**
* Constructor -
*
* create a new BadgeView instance attached to a target
* {@link android.widget.TabWidget} tab at a given index.
*
* @param context
* context for this view.
* @param target
* the TabWidget to attach the badge to.
* @param index
* the position of the tab within the target.
*/
public BadgeView(Context context, TabWidget target, int index)
{
this(context, null, android.R.attr.textViewStyle, target, index);
}
public BadgeView(Context context, AttributeSet attrs, int defStyle)
{
this(context, attrs, defStyle, null, 0);
}
public BadgeView(Context context, AttributeSet attrs, int defStyle,
View target, int tabIndex)
{
super(context, attrs, defStyle);
init(context, target, tabIndex);
}
private void init(Context context, View target, int tabIndex)
{
this.context = context;
this.target = target;
this.targetTabIndex = tabIndex;
// apply defaults
badgePosition = DEFAULT_POSITION;
badgeMarginH = dipToPixels(DEFAULT_MARGIN_DIP);
badgeMarginV = badgeMarginH;
badgeColor = DEFAULT_BADGE_COLOR;
setTypeface(Typeface.DEFAULT_BOLD);
int paddingPixels = dipToPixels(DEFAULT_LR_PADDING_DIP);
setPadding(paddingPixels, 0, paddingPixels, 0);
setTextColor(DEFAULT_TEXT_COLOR);
fadeIn = new AlphaAnimation(0, 1);
fadeIn.setInterpolator(new DecelerateInterpolator());
fadeIn.setDuration(200);
fadeOut = new AlphaAnimation(1, 0);
fadeOut.setInterpolator(new AccelerateInterpolator());
fadeOut.setDuration(200);
isShown = false;
if (this.target != null)
{
applyTo(this.target);
} else
{
show();
}
}
private void applyTo(View target)
{
LayoutParams lp = target.getLayoutParams();
ViewParent parent = target.getParent();
FrameLayout container = new FrameLayout(context);
if (target instanceof TabWidget)
{
// set target to the relevant tab child container
target = ((TabWidget) target).getChildTabViewAt(targetTabIndex);
this.target = target;
((ViewGroup) target).addView(container, new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
this.setVisibility(View.GONE);
container.addView(this);
} else
{
// TODO verify that parent is indeed a ViewGroup
ViewGroup group = (ViewGroup) parent;
int index = group.indexOfChild(target);
group.removeView(target);
group.addView(container, index, lp);
container.addView(target);
this.setVisibility(View.GONE);
container.addView(this);
group.invalidate();
}
}
/**
* Make the badge visible in the UI.
*
*/
public void show()
{
show(false, null);
}
/**
* Make the badge visible in the UI.
*
* @param animate
* flag to apply the default fade-in animation.
*/
public void show(boolean animate)
{
show(animate, fadeIn);
}
/**
* Make the badge visible in the UI.
*
* @param anim
* Animation to apply to the view when made visible.
*/
public void show(Animation anim)
{
show(true, anim);
}
/**
* Make the badge non-visible in the UI.
*
*/
public void hide()
{
hide(false, null);
}
/**
* Make the badge non-visible in the UI.
*
* @param animate
* flag to apply the default fade-out animation.
*/
public void hide(boolean animate)
{
hide(animate, fadeOut);
}
/**
* Make the badge non-visible in the UI.
*
* @param anim
* Animation to apply to the view when made non-visible.
*/
public void hide(Animation anim)
{
hide(true, anim);
}
/**
* Toggle the badge visibility in the UI.
*
*/
public void toggle()
{
toggle(false, null, null);
}
/**
* Toggle the badge visibility in the UI.
*
* @param animate
* flag to apply the default fade-in/out animation.
*/
public void toggle(boolean animate)
{
toggle(animate, fadeIn, fadeOut);
}
/**
* Toggle the badge visibility in the UI.
*
* @param animIn
* Animation to apply to the view when made visible.
* @param animOut
* Animation to apply to the view when made non-visible.
*/
public void toggle(Animation animIn, Animation animOut)
{
toggle(true, animIn, animOut);
}
private void show(boolean animate, Animation anim)
{
if (getBackground() == null)
{
if (badgeBg == null)
{
badgeBg = getDefaultBackground();
}
setBackgroundDrawable(badgeBg);
}
applyLayoutParams();
if (animate)
{
this.startAnimation(anim);
}
this.setVisibility(View.VISIBLE);
isShown = true;
}
private void hide(boolean animate, Animation anim)
{
this.setVisibility(View.GONE);
if (animate)
{
this.startAnimation(anim);
}
isShown = false;
}
private void toggle(boolean animate, Animation animIn, Animation animOut)
{
if (isShown)
{
hide(animate && (animOut != null), animOut);
} else
{
show(animate && (animIn != null), animIn);
}
}
/**
* Increment the numeric badge label. If the current badge label cannot be
* converted to an integer value, its label will be set to "0".
*
* @param offset
* the increment offset.
*/
public int increment(int offset)
{
CharSequence txt = getText();
int i;
if (txt != null)
{
try
{
i = Integer.parseInt(txt.toString());
} catch (NumberFormatException e)
{
i = 0;
}
} else
{
i = 0;
}
i = i + offset;
setText(String.valueOf(i));
return i;
}
/**
* Decrement the numeric badge label. If the current badge label cannot be
* converted to an integer value, its label will be set to "0".
*
* @param offset
* the decrement offset.
*/
public int decrement(int offset)
{
return increment(-offset);
}
private ShapeDrawable getDefaultBackground()
{
int r = dipToPixels(DEFAULT_CORNER_RADIUS_DIP);
float[] outerR = new float[]
{ r, r, r, r, r, r, r, r };
RoundRectShape rr = new RoundRectShape(outerR, null, null);
ShapeDrawable drawable = new ShapeDrawable(rr);
drawable.getPaint().setColor(badgeColor);
return drawable;
}
private void applyLayoutParams()
{
FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
switch (badgePosition)
{
case POSITION_TOP_LEFT:
lp.gravity = Gravity.LEFT | Gravity.TOP;
lp.setMargins(badgeMarginH, badgeMarginV, 0, 0);
break;
case POSITION_TOP_RIGHT:
lp.gravity = Gravity.RIGHT | Gravity.TOP;
lp.setMargins(0, badgeMarginV, badgeMarginH, 0);
break;
case POSITION_BOTTOM_LEFT:
lp.gravity = Gravity.LEFT | Gravity.BOTTOM;
lp.setMargins(badgeMarginH, 0, 0, badgeMarginV);
break;
case POSITION_BOTTOM_RIGHT:
lp.gravity = Gravity.RIGHT | Gravity.BOTTOM;
lp.setMargins(0, 0, badgeMarginH, badgeMarginV);
break;
case POSITION_CENTER:
lp.gravity = Gravity.CENTER;
lp.setMargins(0, 0, 0, 0);
break;
default:
break;
}
setLayoutParams(lp);
}
/**
* Returns the target View this badge has been attached to.
*
*/
public View getTarget()
{
return target;
}
/**
* Is this badge currently visible in the UI?
*
*/
@Override
public boolean isShown()
{
return isShown;
}
/**
* Returns the positioning of this badge.
*
* one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT,
* POSITION_BOTTOM_RIGHT, POSTION_CENTER.
*
*/
public int getBadgePosition()
{
return badgePosition;
}
/**
* Set the positioning of this badge.
*
* @param layoutPosition
* one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT,
* POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSTION_CENTER.
*
*/
public void setBadgePosition(int layoutPosition)
{
this.badgePosition = layoutPosition;
}
/**
* Returns the horizontal margin from the target View that is applied to
* this badge.
*
*/
public int getHorizontalBadgeMargin()
{
return badgeMarginH;
}
/**
* Returns the vertical margin from the target View that is applied to this
* badge.
*
*/
public int getVerticalBadgeMargin()
{
return badgeMarginV;
}
/**
* Set the horizontal/vertical margin from the target View that is applied
* to this badge.
*
* @param badgeMargin
* the margin in pixels.
*/
public void setBadgeMargin(int badgeMargin)
{
this.badgeMarginH = badgeMargin;
this.badgeMarginV = badgeMargin;
}
/**
* Set the horizontal/vertical margin from the target View that is applied
* to this badge.
*
* @param horizontal
* margin in pixels.
* @param vertical
* margin in pixels.
*/
public void setBadgeMargin(int horizontal, int vertical)
{
this.badgeMarginH = horizontal;
this.badgeMarginV = vertical;
}
/**
* Returns the color value of the badge background.
*
*/
public int getBadgeBackgroundColor()
{
return badgeColor;
}
/**
* Set the color value of the badge background.
*
* @param badgeColor
* the badge background color.
*/
public void setBadgeBackgroundColor(int badgeColor)
{
this.badgeColor = badgeColor;
badgeBg = getDefaultBackground();
}
private int dipToPixels(int dip)
{
Resources r = getResources();
float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip,
r.getDisplayMetrics());
return (int) px;
}
}
Cheeses类：是一个自定义数据的类！
DemoActivity类：主要界面类！
主要操作：
//添加3个标签
final TabHost tabHost = getTabHost();
tabHost.addTab(tabHost.newTabSpec("demos").setIndicator("Badge Demos")
.setContent(R.id.tab1));
tabHost.addTab(tabHost.newTabSpec("adapter")
.setIndicator("List Adapter").setContent(R.id.tab2));
tabHost.addTab(tabHost.newTabSpec("tests").setIndicator("Layout Tests")
.setContent(R.id.tab3));
// *** default badge ***
//自定义视图1
View target = findViewById(R.id.default_target);
BadgeView badge = new BadgeView(this, target);
badge.setText("1");
badge.show();
// *** set position ***
btnPosition = (Button) findViewById(R.id.position_target);
//自定义视图2
badge1 = new BadgeView(this, btnPosition);
badge1.setText("12");
badge1.setBadgePosition(BadgeView.POSITION_CENTER);
btnPosition.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
badge1.toggle();
}
});
……
代码少，适合学习！~
学习的目标是成熟！~